Harman Kardon
| Brand on Tube | Harman Kardon |
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| Real Tube Manufacturer | Siemens |
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| Country | West Germany |
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| Etched code on Tube | 1990/1710 |
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| Tip Shape | Pinched Tip |
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| Glass Color | Clear Glass |
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| Mica | Double |
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| Getter | O-Getter Halo |
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| Getter Support | One |
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| Plate Look | Ribbed / Scale |
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| Plate Size | 17mm |
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| Plate Color | Shiny Gray |
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| Pin Color | Silver Pins |
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